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Table 2 Weight factors for observation error covariance matrices in generation of the IGRF13-SV candidate model

From: A candidate secular variation model for IGRF-13 based on MHD dynamo simulation and 4DEnVar data assimilation

Iteration# \(\alpha_{S}\) (factor for \({\mathbf{R}}_{S}\))
[\(\times 1.4 \times 10^{4}\)]
\(\alpha_{UW} \left( {{\text{factor for }}{\mathbf{R}}_{U} ,{\mathbf{R}}_{W} } \right)\)
[\(\times 300\)]
1 1.0 1.0
2 0.2 0.2
3 0.1 0.2
4 0.02 0.2
5 0.001 0.2